Portable grinder



FIG. 1 is a front view of portable grinder embodying my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a plan view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a front perspective view; and,

FIG. 8 is a rear perspective view.

The ornamental design for portable grinder, as shown and described.